18604

Appears in sequences

• Number of n-node trees with a forbidden limb of length 6.at n=16A002992
• a(n) = floor(n*(n-1)*(n-2)*(n-3)/5).at n=19A011915
• Number of connected planar graphs with n nodes and even degrees (i.e., that are Eulerian).at n=10A049365
• Expansion of 1/(x^k*(1 - x - 3*x^(k+1))) for k=3.at n=18A143454
• a(n) = 4*(5*n^2 - 5*n + 1).at n=30A193448
• Number of length n 1..(2+1) arrays with every leading partial sum divisible by 2, 3, 5, 7 or 11.at n=11A254941
• Number of nX7 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 0 or 2 neighboring 1s.at n=2A297337
• T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 0 or 2 neighboring 1s.at n=38A297338
• Number of 3Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 0 or 2 neighboring 1s.at n=6A297340
• Coefficients in expansion of 1/(1 - x - 3*x^4).at n=21A318774